COUPLING OF SURFACE AND VOLUME DIPOLE OSCILLATIONS IN C60 MOLECULES

M. BRACK, P. WINKLER, M. V. N. MURTHY
2008 International Journal of Modern Physics E  
We first give a short review of the "local-current approximation" (LCA), derived from a general variation principle, which serves as a semiclassical description of strongly collective excitations in finite fermion systems starting from their quantum-mechanical mean-field ground state. We illustrate it for the example of coupled translational and compressional dipole excitations in metal clusters. We then discuss collective electronic dipole excitations in C_60 molecules (Buckminster
more » ... We show that the coupling of the pure translational mode ("surface plasmon") with compressional volume modes in the semiclasscial LCA yields semi-quantitative agreement with microscopic time-dependent density functional (TDLDA) calculations, while both theories yield qualitative agreement with the recent experimental observation of a "volume plasmon".
doi:10.1142/s021830130800963x fatcat:tfo5gr6c3nf5bih5w4ui5hty6e